Electronic components can fail – but the good news is that you can easily test it with help of an component-tester which is integrated in many oscilloscopes (or you can build it yourself if your oscilloscope does not have one. Any dual-channel oscilloscope with xy-mode does the job (even if it is older than your oric itself – analog or tube-powered).

The black-probe is connected to ground (GND) while the red-probe is powered from the scope with a small voltage (10 V peak-to-peak) and a limited current (some milliamps) to prevent destruction of components.

Important: Your Oric (or any other device under test) must not connected / wired / powered over any other lines. The whole tests can be done on machines which are powered off and complete uncabled. You also should discarge capacitors before your testing to prevent the oscilloscope from being damaged.